Coil component

Abstract

The present disclosure provides a coil component including: a body having a first surface, a second surface opposite to the first surface in a first direction, and a side surface connecting the first surface and the second surface to each other; a support member provided in the main body; a coil disposed on each of one surface of the support member and another surface of the support member opposite to the one surface in the first direction, the coil including a first lead-out portion and a second lead-out portion extending to first and second side surfaces of the main body, respectively; and a first dummy lead-out portion disposed on the other surface of the support member and connected to the first lead-out portion. W2 / W1 satisfies 0.3 or more and 0.8 or less, W1 is a width of the first lead-out portion, and W2 is a width of the first dummy lead-out portion.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0121275 filed on September 12, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] The present disclosure relates to a coil assembly. Background Art

[0003] An inductor (a type of coil component) is a representative passive electronic component used in electronic devices together with a resistor and a capacitor, and the inductor is used in combination with a capacitor to use electromagnetic properties in a resonant circuit and a filter circuit that amplifies a signal in a specific frequency band.

[0004] One of the important performances of a power inductor is its energy efficiency. Even when a direct current (DC) bias is applied, the smaller the change in direct current resistance (Rdc), the lower the loss caused by heat, which leads to improved efficiency. When measuring the DC resistance at different positions of each external electrode terminal, the DC resistance of a conventional thin-film power inductor has discrete values, and the reduction in the deviation of the DC resistance can be directly related to ensuring the energy efficiency of the power inductor, that is, the smaller the deviation of the DC resistance at different positions, the higher the energy efficiency. Summary of the invention

[0005] An aspect of the present disclosure is to improve a deviation in direct current resistance (Rdc) at different positions of each external electrode terminal.

[0006] According to one aspect of the present disclosure, a coil component is provided, the coil component comprising: a body having a first surface, a second surface opposite to the first surface in a first direction, and a plurality of side surfaces connecting the first surface and the second surface to each other, the plurality of side surfaces comprising a first side surface and a second side surface opposite to each other in a second direction; a support member disposed in the body; a coil disposed on each of the first surface of the support member and the second surface of the support member, the second surface of the support member being opposite to the first surface of the support member in the first direction, the coil comprising a first lead-out portion and a second lead-out portion extending to the first side surface and the second side surface, respectively; and a first dummy lead-out portion disposed on the second surface of the support member and connected to the first lead-out portion. When the width of the first lead-out portion in the second direction is W1 and the width of the first dummy lead-out portion in the second direction is W2, W2 / W1 may satisfy 0.3 or more and 0.8 or less.

[0007] According to another aspect of the present disclosure, a coil component is provided, the coil component comprising: a body having a first surface, a second surface opposite to the first surface in a first direction, and a plurality of side surfaces connecting the first surface and the second surface to each other, the plurality of side surfaces including a first side surface and a second side surface opposite to each other in a second direction; a support member disposed in the body; a coil disposed on each of the first surface of the support member and the second surface of the support member, the second surface of the support member being opposite to the first surface of the support member in the first direction, the coil comprising a first lead-out portion and a second lead-out portion extending to the first side surface and the second side surface, respectively; a first dummy lead-out portion disposed on the second surface of the support member and connected to the first lead-out portion; and a second dummy lead-out portion disposed on the first surface of the support member and connected to the second lead-out portion. When the width of each of the first lead-out portion and the second lead-out portion in the second direction is W1 and the width of each of the first dummy lead-out portion and the second dummy lead-out portion in the second direction is W2, W2 / W1 may satisfy 0.2 or more and 0.5 or less.

[0008] An aspect of the present disclosure provides a coil component having improved deviation in direct current resistance (Rdc) at different positions of each external electrode terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other aspects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:

[0010] Figure 1 is a schematic perspective view of a coil component according to a first exemplary embodiment of the present disclosure;

[0011] Figure 2 is an exploded view of a coil assembly according to a first example embodiment of the present disclosure;

[0012] Figure 3 It is along Figure 1 A schematic cross-sectional view taken along line II' of ;

[0013] Figure 4 is a cross-sectional view of a variation of the coil component according to the first exemplary embodiment of the present disclosure, and corresponds to Figure 3 ;

[0014] Figure 5 is a schematic perspective view of a coil component according to a second exemplary embodiment of the present disclosure;

[0015] Figure 6 is an exploded view of a coil assembly according to a second example embodiment of the present disclosure;

[0016] Figure 7 It is along Figure 5 A schematic cross-sectional view taken along line II-II';

[0017] Figure 8 is a cross-sectional view of a variation of the coil component according to the second exemplary embodiment of the present disclosure, and corresponds to Figure 7 ;as well as

[0018] Fig. 9 is a cross-sectional view of a coil component according to a comparative example embodiment. DETAILED DESCRIPTION

[0019] Hereinafter, example embodiments of the present disclosure are described with reference to specific example embodiments and the accompanying drawings. However, the present disclosure may be illustrated in many different forms and should not be construed as being limited to the specific example embodiments set forth herein. In addition, example embodiments of the present disclosure may be provided to more fully describe the present disclosure to those skilled in the art. Therefore, for clarity of description, the shapes and sizes of the elements in the accompanying drawings may be exaggerated, and the elements represented by the same reference numerals in the accompanying drawings may be the same elements.

[0020] In the drawings, an X direction may be defined as a first direction or a thickness direction, a Y direction may be defined as a second direction or a length direction, and a Z direction may be defined as a third direction or a width direction.

[0021] In order to clearly illustrate the present disclosure, parts irrelevant to the description are omitted, and dimensions such as thickness are exaggerated to clearly indicate layers and regions, and like parts having the same function in the same scope are denoted by like reference numerals throughout the specification.

[0022] Throughout the specification, unless specifically stated otherwise, when an element is referred to as “comprising” or “including,” it means that the element may also include other elements, rather than excluding other elements.

[0023] Hereinafter, a coil component according to an example embodiment of the present disclosure will be described, but the present disclosure is not necessarily limited thereto.

[0024] (First exemplary embodiment)

[0025] Figure 1 is a schematic perspective view of a coil component according to a first example embodiment of the present disclosure. Figure 2 is an exploded view of a coil component according to a first example embodiment of the present disclosure. Figure 3 It is along Figure 1 Schematic cross-sectional view taken along line II'.

[0026] Reference Figures 1 to 3, the coil component 1000 according to the first exemplary embodiment of the present disclosure may include a body 100 , a support member 200 , a coil 300 , and a first dummy lead-out portion 431 , and may further include external electrodes 510 and 520 and an insulating film IF.

[0027] The body 100 may form an outer shape of the coil component 1000 according to the present example embodiment, and the support member 200 and the coil 300 may be buried in the body 100 .

[0028] The body 100 may have a hexahedral shape as a whole.

[0029] Hereinafter, the first exemplary embodiment of the present disclosure will be described in the case where the main body 100 has a hexahedral shape. However, the above description does not exclude a coil component including a main body having a shape other than the hexahedral shape from the scope of the present exemplary embodiment.

[0030] Reference Figure 1 The body 100 may have a first surface 101 and a second surface 102 opposite to each other in a first direction (X direction), a first side surface 103 and a second side surface 104 opposite to each other in a second direction (Y direction), and a third side surface 105 and a fourth side surface 106 opposite to each other in a third direction (Z direction). The body 100 may have a plurality of side surfaces connecting the first surface 101 and the second surface 102 of the body 100 to each other, and the plurality of side surfaces may include the first side surface 103, the second side surface 104, the third side surface 105, and the fourth side surface 106.

[0031] For example, the body 100 may be formed such that the coil component 1000 including the outer electrodes 510 and 520 to be described below according to the present exemplary embodiment has a length of 2.5 mm, a width of 2.0 mm, and a thickness of 2.0 mm, but the present disclosure is not limited thereto. The above numerical values ​​are merely design values ​​that do not reflect process errors, etc., and the dimensions including process errors should be considered to fall within the scope of the present disclosure.

[0032] The main body 100 may include a magnetic material and an insulating resin. Specifically, the main body 100 may be formed by laminating one or more magnetic composite sheets in which the magnetic material is dispersed in the insulating resin. However, the main body 100 may have a structure other than a structure in which the magnetic material is dispersed in the insulating resin. For example, the main body 100 may be formed using a magnetic material such as ferrite, or may be formed using a non-magnetic material.

[0033] The magnetic material may be ferrite particles or magnetic metal particles.

[0034] The ferrite particles can be, for example, at least one of the following materials: spinel ferrite particles, such as Mg-Zn-based ferrite particles, Mn-Zn-based ferrite particles, Mn-Mg-based ferrite particles, Cu-Zn-based ferrite particles, Mg-Mn-Sr-based ferrite particles, Ni-Zn-based ferrite particles, etc.; hexagonal ferrite particles, such as Ba-Zn-based ferrite particles, Ba-Mg-based ferrite particles, Ba-Ni-based ferrite particles, Ba-Co-based ferrite particles, Ba-Ni-Co-based ferrite particles, etc.; garnet-type ferrite particles, such as Y-based ferrite particles, etc.; and Li-based ferrite particles.

[0035] The magnetic metal particles may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the magnetic metal particles may be at least one of the following materials: pure iron particles, Fe-Si-based alloy particles, Fe-Si-Al-based alloy particles, Fe-Ni-based alloy particles, Fe-Ni-Mo-based alloy particles, Fe-Ni-Mo-Cu-based alloy particles, Fe-Co-based alloy particles, Fe-Ni-Co-based alloy particles, Fe-Cr-based alloy particles, Fe-Cr-Si-based alloy particles, Fe-Si-Cu-Nb-based alloy particles, Fe-Ni-Cr-based alloy particles, and Fe-Cr-Al-based alloy particles.

[0036] The magnetic metal particles may be amorphous or crystalline. For example, the magnetic metal particles may be Fe-Si-B-Cr based amorphous alloy particles, but the present disclosure is not necessarily limited thereto.

[0037] Each of the ferrite particles and the magnetic metal particles may have an average diameter of about 0.1 μm to about 30 μm, but the present disclosure is not limited thereto.

[0038] The body 100 may include two or more types of magnetic materials dispersed in an insulating resin. Here, different types of magnetic materials refer to magnetic materials dispersed in the resin being distinguished from each other by at least one of average diameter, composition, crystallinity, and shape.

[0039] The insulating resin may include at least one of epoxy resin, polyimide, liquid crystal polymer, etc., but the present disclosure is not limited thereto.

[0040] The body 100 may include a core 110 passing through a central portion of each of a support member 200 and a coil 300 to be described below. The core 110 may be formed by filling a through hole of a central portion of each of the support member 200 and the coil 300 with a magnetic composite sheet, but the present disclosure is not limited thereto.

[0041] The support member 200 may be buried in the body 100. The support member 200 may be configured to support the coil 300 to be described below.

[0042] The support member 200 may be formed using an insulating material including a thermosetting insulating resin (such as epoxy resin), a thermoplastic insulating resin (such as polyimide), or a photosensitive insulating resin, or an insulating material prepared by impregnating a reinforcing material (such as glass fiber or an inorganic filler) in an insulating resin. For example, the support member 200 may be formed using an insulating material such as a prepreg, an Ajinomoto build-up film (ABF), FR-4, a bismaleimide triazine (BT) resin, a photosensitive dielectric (PID), etc., but the present disclosure is not limited thereto.

[0043] The inorganic filler may be at least one selected from the group consisting of silicon dioxide (SiO2), aluminum oxide (Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, clay, mica powder, aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium carbonate (CaCO3), magnesium carbonate (MgCO3), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO3), barium titanate (BaTiO3) and calcium zirconate (CaZrO3).

[0044] When the support member 200 is formed using an insulating material including a reinforcing material, the support member 200 can provide more excellent rigidity. When the support member 200 is formed using an insulating material that does not include glass fiber, it can be helpful to reduce the overall thickness of the coil component 1000 according to the present example embodiment. When the support member 200 is formed using an insulating material including a photosensitive insulating resin, the number of processes for forming the coil 300 can be reduced. Therefore, it can be helpful to reduce production costs, and fine vias can be formed.

[0045] The coil 300 may be buried in the body 100 and may be disposed on at least one surface of the support member 200 to exhibit the performance of the coil component 1000. For example, when the coil component 1000 according to the present example embodiment is used as a power inductor, the coil 300 may be used to stabilize the power of the electronic device by storing an electric field as a magnetic field and maintaining an output voltage.

[0046] The coil 300 may include coil patterns 311 and 312, lead-out portions 331 and 332, and vias 321 and 322. Figure 3 In the direction of the support member 200 , the first coil pattern 311 and the first lead-out portion 331 may be disposed on one surface (upper surface) of the support member 200 , and the second coil pattern 312 and the second lead-out portion 332 may be disposed on the other surface (lower surface) of the support member 200 .

[0047] Each of the first coil pattern 311 and the second coil pattern 312 may have a planar spiral shape that forms at least one turn using the core 110 as an axis. For example, the first coil pattern 311 may form at least one turn on the upper surface of the support member 200 using the core 110 as an axis. Similarly, the second coil pattern 312 may form at least one turn on the lower surface of the support member 200 using the core 110 as an axis.

[0048] The first lead-out portion 331 may be disposed on one surface (upper surface) of the support member 200, may extend to the first side surface 103, and may be connected to a first external electrode 510 to be described below. The second lead-out portion 332 may be disposed on the other surface (lower surface) of the support member 200, may extend to the second side surface 104, and may be connected to a second external electrode 520 to be described below.

[0049] The first via 321 may pass through the support member 200 to contact each of the first coil pattern 311 and the second coil pattern 312. Therefore, the coil 300 may generally be used as a single coil forming one or more turns with respect to the core 110. The coil component according to the present disclosure may further include a second via 322, which will be described in detail below.

[0050] At least one of the coil patterns 311 and 312, the vias 321 and 322, and the lead-out portions 331 and 332 may include one or more conductive layers. For example, when the first coil pattern 311, the first lead-out portion 331, and the first via 321 are formed using plating, the first coil pattern 311, the first lead-out portion 331, and the first via 321 may include a seed layer (such as an electroless plating layer) and an electroplating layer, respectively. Here, the electroplating layer may have a single-layer structure or a multi-layer structure. The electroplating layer having a multi-layer structure may be formed to have a conformal film structure in which one electroplating layer is formed on another electroplating layer, or may be formed to have a shape in which one electroplating layer is only stacked on one surface of another electroplating layer. The seed layer of the first coil pattern 311, the seed layer of the first lead-out portion 331, and the seed layer of the first via 321 may be formed integrally with each other so that no boundary may be formed therebetween, but the present disclosure is not limited thereto.

[0051] For another example, the first coil pattern 311 and the second coil pattern 312 are formed separately from each other and then stacked on the support member 200 to form the coil 300, and the first via 321 may include a low melting point metal layer having a melting point lower than that of the high melting point metal layer. Here, the low melting point metal layer may be formed using a solder including lead (Pb) and / or tin (Sn). When the first coil pattern 311 and the second coil pattern 312 are stacked on the support member 200, at least a portion of the low melting point metal layer may be melted due to pressure and temperature, and thus, for example, an intermetallic compound layer (IMC layer) may be formed at the boundary between the low melting point metal layer and the first coil pattern 311 and between the low melting point metal layer and the second coil pattern 312.

[0052] Relative to Figure 3 In the direction of the support member 200, the first coil pattern 311 and the second coil pattern 312 may be formed to protrude from the upper surface and the lower surface of the support member 200, respectively, and the first lead portion 331 and the second lead portion 332 may be formed to protrude from the upper surface and the lower surface of the support member 200, respectively. For another example, the first coil pattern 311 and the first lead portion 331 may be formed to protrude from the upper surface of the support member 200, and the second coil pattern 312 and the second lead portion 332 may be buried in the lower surface of the support member 200, so that the lower surface of the second coil pattern 312 and the lower surface of the second lead portion 332 may be exposed to the lower surface of the support member 200. In this case, a recess may be formed in the lower surface of the support member 200, so that the lower surface of the second coil pattern 312 and / or the lower surface of the second lead portion 332 and the lower surface of the support member 200 may not be located on the same plane. For another example, the second coil pattern 312 and the second lead-out portion 332 may be formed to protrude from the lower surface of the support member 200, and the first coil pattern 311 and the first lead-out portion 331 may be buried in the upper surface of the support member 200, so that the upper surface of each of the first coil pattern 311 and the first lead-out portion 331 may be exposed to the upper surface of the support member 200. In this case, a recess may be formed in the upper surface of the support member 200, so that the upper surface of the first coil pattern 311 and / or the upper surface of the first lead-out portion 331 and the upper surface of the support member 200 may not be located on the same plane.

[0053] Each of the coil patterns 311 and 312, the vias 321 and 322, and the lead-out portions 331 and 332 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), and / or alloys thereof, but the present disclosure is not limited thereto.

[0054] Fig. 9 is a cross-sectional view of a coil component according to a comparative example embodiment. Fig. 9, in the coil component C according to the comparative example embodiment, the ends of the coil patterns 31 and 32 may be connected to the external electrodes 51 and 52 , respectively, and no dummy lead-out portion is formed.

[0055] When measuring the direct current resistance (Rdc) of the coil component, the measured direct current resistance value may vary depending on the position of the external electrode terminal on which the measurement is performed. In particular, the direct current resistance value of a thin film inductor having a low resistance of 10 mΩ or less may have a measurement deviation of 20%.

[0056] That is, the DC resistance of a conventional thin film power inductor may have discrete values ​​when measuring the DC resistance at different positions of each external electrode terminal, and reduction in the deviation of the DC resistance may be directly related to ensuring energy efficiency of the power inductor.

[0057] Therefore, the present disclosure proposes a coil component structure that improves the deviation of the direct current resistance (Rdc) at different positions of each external electrode terminal by introducing a dummy lead-out portion 431 (described below).

[0058] The coil component 1000 according to the present example embodiment may include a first dummy lead-out portion 431 connected to the first lead-out portion 331 , the first dummy lead-out portion 431 being disposed on the other surface of the support member 200 .

[0059] Specifically, the first dummy lead-out portion 431 may be disposed on the other surface (lower surface) of the support member 200 , and may not be in physical contact with the second coil pattern 312 disposed on the other surface (lower surface) of the support member 200 .

[0060] The first dummy lead-out portion 431 may extend to the first side surface 103 of the body 100 to be connected to the first external electrode 510 .

[0061] The first dummy lead-out portion 431 may be connected to the first lead-out portion 331 and the second via 322. The second via 322 may pass through the support member 200 to connect the first lead-out portion 331 and the first dummy lead-out portion 431 to each other. However, the present disclosure is not necessarily limited thereto. As in the modified example to be described below, the first lead-out portion 331 and the first dummy lead-out portion 431 may be connected to the first metal layer 610 instead of the second via 322.

[0062] Table 1 below shows the first exemplary embodiment and the second exemplary embodiment (hereinafter referred to as Figures 5 to 8 ) and the measurement results of the performance of the coil components of the comparative example embodiments.

[0063] In the case where the dummy lead-out portion is formed on one surface of the support member (first exemplary embodiment), the case where the dummy lead-out portion is formed on both surfaces of the support member (second exemplary embodiment), and the case where the dummy lead-out portion is not formed (comparative exemplary embodiment), the inductance (Ls), direct current resistance (Rdc), and saturation current (Isat) are measured, and the coefficient of variation of Rdc and the measurement deviation (%) are calculated. In each exemplary embodiment, the dummy lead-out portion is formed to have the same width of 349 μm and the same thickness of 300 μm.

[0064] [Table 1]

[0065] Referring to Table 1, it can be confirmed that the first and second exemplary embodiments in which the dummy lead-out portions are formed have smaller coefficient of variation values ​​and measurement deviation values ​​of Rdc than the comparative exemplary embodiment in which the dummy lead-out portions are not formed. That is, due to the formation of the dummy lead-out portions, the deviation value when measuring the resistance of different positions of each external electrode terminal is reduced.

[0066] Furthermore, it can be confirmed that the value of Ls of the first and second exemplary embodiments is reduced compared to the comparative exemplary embodiment. That is, the deviation value and Ls may be in a trade-off relationship, and it is necessary to ensure appropriate performance of the coil component.

[0067] Therefore, the coil component 1000 according to the present exemplary embodiment can adjust the performance of the coil component by adjusting the width of the dummy lead-out portion. Specifically, when one dummy lead-out portion (first dummy lead-out portion 431) is formed, when the width of the first lead-out portion 331 in the second direction (Y direction) is W1 and the width of the first dummy lead-out portion 431 in the second direction (Y direction) is W2, W2 / W1 may satisfy 0.3 or more and 0.8 or less.

[0068] Here, the width of the lead-out portion (dummy lead-out portion) may represent the average length of the lead-out portion (dummy lead-out portion) in the second direction (Y direction). The width of the first lead-out portion and the width of the first dummy lead-out portion may be measured using the following method. A sample having a cross section may be prepared, which is exposed by grinding the coil component to 1 / 2 depth in the third direction (Z direction). The prepared sample may be observed using an optical microscope or the like, and the length of each of the first lead-out portion and the first dummy lead-out portion in the second direction (Y direction) may be measured. Multiple (n) measurements may be performed, and the width may be obtained by calculating the arithmetic mean of the measured values. Even if not described in the present disclosure, other methods and / or tools understood by a person of ordinary skill in the art may be used.

[0069] Table 2 below shows the change rates of Ls and Rdc according to the value of W2 / W1 when the width of the first lead portion 331 is W1 and the width of the first dummy lead portion 431 is W2 in the case where one dummy lead portion (first dummy lead portion 431 ) is formed.

[0070] [Table 2]

[0071] Referring to Table 2 above, when W2 / W1 is 0.3 or more and 0.8 or less, the absolute value of the change rate of Ls can be within 10%, and the dispersion of the resistance value can be improved without significantly degrading the Ls characteristic.

[0072] The insulating film IF may be formed on the surface of the coil 300 and the surface of the dummy lead-out portion 431. The insulating film IF may cover the coil 300, the dummy lead-out portion 431 and the support member 200 in one piece. Specifically, the insulating film IF may be disposed between the coil 300 and the main body 100, between the dummy lead-out portion 431 and the main body 100, and between the support member 200 and the main body 100. The insulating film IF may be formed along the surface of the support member 200 formed with the coil 300, but the present disclosure is not limited thereto. The insulating film IF may fill an area such as a space between each adjacent turn of the coil 300. The insulating film IF may be used to electrically isolate the coil 300 and the main body 100 from each other, and may include a known insulating material such as polyparaxylene, but the present disclosure is not limited thereto. For another example, the insulating film IF may include an insulating material such as epoxy resin (rather than polyparaxylene). The insulating film IF may be formed using vapor deposition, but the present disclosure is not limited thereto. For another example, the insulating film IF may be formed by applying an insulating material for forming an insulating film on the opposite surface of the support member 200 formed with the coil 300 and curing it, or may be formed by applying an insulating paste for forming an insulating film on the opposite surface of the support member 200 formed with the coil 300 and curing it. The insulating film IF may be omitted in this example embodiment. For example, when the main body 100 has sufficient resistance at the designed operating current and voltage of the coil component 1000, the insulating film IF may be omitted in this example embodiment.

[0073] The external electrodes 510 and 520 may be disposed on the surface of the body 100 to be respectively connected to the first lead-out portion 331 and the second lead-out portion 332. The first lead-out portion 331 and the second lead-out portion 332 may extend to the first side surface 103 and the second side surface 104, respectively. Therefore, the first external electrode 510 may be disposed on the first side surface 103 to contact the first lead-out portion 331 extending to the first side surface 103 of the body 100, and the second external electrode 520 may be disposed on the second side surface 104 to contact the second lead-out portion 332 extending to the second side surface 104 of the body 100.

[0074] In addition, in the present example embodiment, the first dummy lead-out portion 431 may also extend to the first side surface 103 of the body 100 to be contact-connected to the first external electrode 510 .

[0075] The first external electrode 510 and the second external electrode 520 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti) and / or an alloy thereof, but the present disclosure is not limited thereto. The first external electrode 510 and the second external electrode 520 may have a multilayer structure. For example, the first layer of each of the first external electrode 510 and the second external electrode 520 connected to the coil 300 may be a conductive resin layer including conductive particles (including at least one of copper (Cu) and silver (Ag)) and an insulating resin, or may be a copper (Cu) plating layer. In addition, the second layer of each of the first external electrode 510 and the second external electrode 520 may have a double-layer structure including a nickel (Ni) plating layer and a tin (Sn) plating layer. The first layer may be formed using electroplating, vapor deposition such as sputtering, or may be formed by coating a conductive paste including conductive particles such as copper (Cu) and / or silver (Ag) and curing it, and the second layer may be formed using electroplating.

[0076] Figure 4 is a cross-sectional view of a variation of the coil component according to the first exemplary embodiment of the present disclosure, and corresponds to Figure 3 .

[0077] In a modification of the coil component according to the first example embodiment, the coil component 1000 ′ may further include a first metal layer 610 disposed on the first side surface 103 of the body 100 .

[0078] The first metal layer 610 may be disposed on the first side surface 103 of the body 100 to contact the first lead-out portion 331 and the first dummy lead-out portion 431. In the above-described first exemplary embodiment, the first lead-out portion 331 and the first dummy lead-out portion 431 may be connected to each other through the second via 322. However, in the present modification, the first lead-out portion 331 and the first dummy lead-out portion 431 may be connected to each other through the first metal layer 610. Therefore, in the present modification, the second via 322 may be omitted.

[0079] The first metal layer 610 may be used to connect the first lead portion 331 and the first dummy lead portion 431 to each other and may be used to improve the contact force of the external electrode 510. Specifically, the first metal layer 610 may expand the contact area between the first lead portion 331 and the external electrode 510.

[0080] The first metal layer 610 may include at least one of Cu (copper), Pd (palladium), and Cr (chromium), and may be formed using electroplating, but the present disclosure is not limited thereto. In addition, the coil component 1000' may further include a second metal layer 620 disposed on the second side surface 104 of the body 100, and the contents described above with respect to the first metal layer 610 may also apply to the second metal layer 620. Optionally, the coil component 1000' does not include the second metal layer 620, and the second external electrode 520 is connected to the second lead-out portion 332.

[0081] (Second exemplary embodiment)

[0082] Figure 5 is a schematic perspective view of a coil component according to a second example embodiment of the present disclosure.

[0083] Figure 6 is an exploded view of a coil component according to a second example embodiment of the present disclosure.

[0084] Figure 7 It is along Figure 5 Schematic cross-sectional view taken along line II-II'.

[0085] Reference Figures 5 to 7 The coil component 2000 according to the second exemplary embodiment of the present disclosure may include a second dummy lead-out portion 432 connected to the second lead-out portion 332 disposed on one surface of the support member 200 . In addition, the coil component 2000 may further include a third via hole 323 .

[0086] Specifically, the second dummy lead-out portion 432 may be disposed on one surface (upper surface) of the support member 200 , and may not be in physical contact with the first coil pattern 311 disposed on the one surface (upper surface) of the support member 200 .

[0087] The second dummy lead-out portion 432 may extend to the second side surface 104 of the body 100 to be connected to the second external electrode 520 .

[0088] The second dummy lead-out portion 432 may be connected to the second lead-out portion 332 through the third via 323. The third via 323 may pass through the support member 200 to connect the second lead-out portion 332 and the second dummy lead-out portion 432 to each other. However, the present disclosure is not necessarily limited thereto. As in the variation described below, the second lead-out portion 332 and the second dummy lead-out portion 432 may be connected to each other through the second metal layer 620 instead of the third via 323.

[0089] Compared with the first exemplary embodiment, the coil component 2000 according to the second exemplary embodiment may include two dummy lead-out portions 431 and 432. In addition, the lead-out portion and the dummy lead-out portion may have different widths. Specifically, when the width of each of the first lead-out portion 331 and the second lead-out portion 332 in the second direction (Y direction) is W1 and the width of each of the first dummy lead-out portion 431 and the second dummy lead-out portion 432 in the second direction (Y direction) is W2, W2 / W1 may satisfy 0.2 or more and 0.5 or less.

[0090] The first and second lead-out portions 331 and 332 may have the same width, denoted by W1 , and the first and second dummy lead-out portions 431 and 432 may have the same width, denoted by W2 .

[0091] As a method of measuring the width of the second lead-out portion 332 and the width of the second dummy lead-out portion 432, a method similar to the above-described method of measuring the width of the first lead-out portion 331 and the width of the first dummy lead-out portion 431 according to the first exemplary embodiment may be adopted. In addition, the contents described above with respect to the first dummy lead-out portion 431 and the second via 322 may be similarly applied to the second dummy lead-out portion 432 and the third via 323, respectively.

[0092] Table 3 below shows the change rates of inductance (Ls) and DC resistance (Rdc) according to the value of W2 / W1 when the width of each of the first lead portion 331 and the second lead portion 332 is W1 and the width of each of the first dummy lead portion 431 and the second dummy lead portion 432 is W2 in the case where two dummy lead portions 431 and 432 are formed.

[0093] [Table 3]

[0094] Referring to Table 3, when W2 / W1 is 0.2 or more and 0.5 or less, the absolute value of the change rate of Ls can be within 10%, and the dispersion of the resistance value can be improved without significantly degrading the Ls characteristic.

[0095] That is, compared to the first exemplary embodiment, the dummy lead portions 431 and 432 may be symmetrically formed on opposite surfaces of the support member 200 , thereby improving the dispersion of resistance values ​​even if the dummy lead portions 431 and 432 have a relatively small width (ratio).

[0096] Figure 8 is a cross-sectional view of a variation of the coil component according to the second exemplary embodiment of the present disclosure, and corresponds to Figure 7 .

[0097] In a modification of the coil component according to the second example embodiment, the coil component 2000 ′ may include a second metal layer 610 disposed on the first side surface 103 of the body 100 and a second metal layer 620 disposed on the second side surface 104 of the body 100 .

[0098] The second metal layer 620 may be disposed on the second side surface 104 of the body 100 to contact the second lead-out portion 332 and the second dummy lead-out portion 432. In the above-described second exemplary embodiment, the second lead-out portion 332 and the second dummy lead-out portion 432 may be connected to each other through the third via 323. However, in the present modification, the second lead-out portion 332 and the second dummy lead-out portion 432 may be connected to each other through the second metal layer 620. Therefore, in the present modification, the third via 323 may be omitted.

[0099] The second metal layer 620 may be used to connect the second lead portion 332 and the second dummy lead portion 432 to each other and may be used to improve the contact force of the external electrode 520. Specifically, the second metal layer 620 may expand the contact area between the second lead portion 332 and the external electrode 520.

[0100] The second metal layer 620 may include at least one of Cu (copper), Pd (palladium), and Cr (chromium), and may be formed using electroplating, but the present disclosure is not limited thereto. In addition, the content described above regarding the second metal layer 620 may also apply to the first metal layer 610. In addition, in the above description, the lead-out portion is connected to the dummy lead-out portion through one of a via and a metal layer, but the present disclosure is not limited thereto, and the lead-out portion may be connected to the dummy lead-out portion through both a via and a metal layer. In addition, the features in the example embodiments described above and their variations may be combined with each other.

[0101] Regarding other elements according to the present exemplary embodiment, the description of the first exemplary embodiment of the present disclosure can be applied in the same manner, and the detailed description thereof will not be repeated, so the detailed description thereof will be omitted.

[0102] While example embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: a body having a first surface, a second surface opposite to the first surface in a first direction, and a plurality of side surfaces connecting the first surface and the second surface to each other, the plurality of side surfaces including a first side surface and a second side surface opposite to each other in a second direction; A support member, disposed in the main body; a coil disposed on each of a first surface of the support member and a second surface of the support member, the second surface of the support member being opposite to the first surface of the support member in the first direction, the coil comprising a first lead-out portion and a second lead-out portion extending to the first side surface and the second side surface, respectively; as well as a first dummy lead-out portion, disposed on the second surface of the support member and connected to the first lead-out portion; When the width of the first lead portion in the second direction is W1 and the width of the first dummy lead portion in the second direction is W2, W2 / W1 satisfies 0.3 or more and 0.8 or less.

2. The coil assembly according to claim 1, wherein: The first dummy lead-out portion extends to the first side surface of the body.

3. The coil assembly according to claim 1, wherein: The coil also includes a first coil pattern, a second coil pattern, and a first via hole, wherein the first coil pattern is arranged on the first surface of the support member and connected to the first lead-out portion, the second coil pattern is arranged on the second surface of the support member and connected to the second lead-out portion, and the first via hole passes through the support member and connects the first coil pattern and the second coil pattern to each other.

4. The coil assembly according to claim 3, wherein: The first dummy lead-out portion is spaced apart from the second coil pattern.

5. The coil assembly according to claim 1, wherein: The width of the first lead-out portion in the second direction is the average length of the first lead-out portion in the second direction, and The width of the first dummy lead-out portion in the second direction is an average length of the first dummy lead-out portion in the second direction.

6. The coil assembly according to claim 1, wherein: The coil further includes a second via hole that passes through the support member and connects the first lead-out portion and the first dummy lead-out portion to each other.

7. The coil assembly according to claim 1, further comprising: a first metal layer, disposed on the first side surface of the main body, The first metal layer is in contact with the first lead-out portion and the first dummy lead-out portion.

8. The coil assembly according to claim 1, further comprising: a first external electrode disposed on the first side surface of the body and connected to the first lead-out portion; as well as A second external electrode is disposed on the second side surface of the body and connected to the second lead-out portion.

9. The coil assembly according to claim 4, wherein: The first dummy lead-out portion is the only dummy lead-out portion included in the coil component.

10. The coil assembly according to claim 9, further comprising: A first metal layer is disposed on the first side surface of the main body, wherein the first metal layer is in contact with the first lead-out portion and the first dummy lead-out portion; a first external electrode disposed on the first metal layer and connected to the first lead-out portion through the first metal layer; and A second external electrode is disposed on the second side surface of the body and connected to the second lead-out portion.

11. A coil assembly, comprising: a body having a first surface, a second surface opposite to the first surface in a first direction, and a plurality of side surfaces connecting the first surface and the second surface to each other, the plurality of side surfaces including a first side surface and a second side surface opposite to each other in a second direction; A support member, disposed in the main body; a coil disposed on each of a first surface of the support member and a second surface of the support member, the second surface of the support member being opposite to the first surface of the support member in the first direction, the coil comprising a first lead-out portion and a second lead-out portion extending to the first side surface and the second side surface, respectively; a first dummy lead-out portion disposed on the second surface of the support member and connected to the first lead-out portion; as well as a second dummy lead-out portion, disposed on the first surface of the support member and connected to the second lead-out portion, When the width of each of the first and second lead portions in the second direction is W1 and the width of each of the first and second dummy lead portions in the second direction is W2, W2 / W1 satisfies 0.2 or more and 0.5 or less.

12. The coil assembly according to claim 11, wherein: The first dummy lead-out portion and the second dummy lead-out portion extend to the first side surface and the second side surface of the body, respectively.

13. The coil assembly according to claim 11, wherein: The coil also includes a first coil pattern, a second coil pattern, and a first via hole, wherein the first coil pattern is arranged on the first surface of the support member and connected to the first lead-out portion, the second coil pattern is arranged on the second surface of the support member and connected to the second lead-out portion, and the first via hole passes through the support member and connects the first coil pattern and the second coil pattern to each other.

14. The coil assembly according to claim 13, wherein: The first dummy lead-out portion is spaced apart from the second coil pattern, and The second dummy lead-out portion is spaced apart from the first coil pattern.

15. The coil assembly according to claim 11, wherein: The width of each of the first lead-out portion and the second lead-out portion in the second direction is an average length of each of the first lead-out portion and the second lead-out portion in the second direction, and A width of each of the first dummy lead-out portion and the second dummy lead-out portion in the second direction is an average length of each of the first dummy lead-out portion and the second dummy lead-out portion in the second direction.

16. The coil assembly according to claim 11, wherein: The coil further includes a second via hole passing through the support member and connecting the first lead-out portion and the first dummy lead-out portion to each other, and a third via hole passing through the support member and connecting the second lead-out portion and the second dummy lead-out portion to each other.

17. The coil assembly according to claim 11, further comprising: A first metal layer and a second metal layer are respectively disposed on the first side surface and the second side surface of the body, wherein the first metal layer is in contact with the first lead-out portion and the first dummy lead-out portion, and The second metal layer contacts the second lead-out portion and the second dummy lead-out portion.

18. The coil assembly according to claim 11, further comprising: a first external electrode disposed on the first side surface of the body and connected to the first lead-out portion; as well as A second external electrode is disposed on the second side surface of the body and connected to the second lead-out portion.

19. The coil assembly according to claim 14, further comprising: An insulating film is located on a surface of the coil, a surface of the first dummy lead-out portion, and a surface of the second dummy lead-out portion.

20. The coil assembly according to claim 19, further comprising: a first external electrode disposed on the first side surface of the body and connected to the first lead-out portion; a second external electrode disposed on the second side surface of the body and connected to the second lead-out portion; as well as A first metal layer and a second metal layer are respectively disposed between the first side surface of the body and the first external electrode and between the second side surface of the body and the second external electrode, wherein the first metal layer contacts and connects the first lead-out portion and the first dummy lead-out portion, The second metal layer contacts and connects the second lead-out portion and the second dummy lead-out portion, and The support member does not include a via hole that passes through the support member and connects the first lead-out portion and the first dummy lead-out portion to each other.

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